This is definitely a beautiful phone by Nokia, but even better the Metro UI is simply gorgeous and slick. If I didn't own an iPhone, I would totally pick the Lumia 900 over any Android phone any day. Simply because it's looks and feels better than any Android device I uses.
And what's remarkable about the Lumia 900 is that it's running a single-core processor with only 512MB of memory and still feel faster and smoother than any dual-core processor Android devices in the market.
But unfortunately for Microsoft, the iPhone came out first and that was 5 years ago. The question now, are they too late into the game? We will have to wait and see.